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Illustration Photons of different energy, frequency and wavelength

<span>Photons of different energy, frequency and wavelength</span>
Photons with different frequency Photons of different wavelength
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Photons are "light particles" which have a certain energy \( W_{\text p } \) (called photon energy). How large this energy is depends on the frequency \( f \) or the wavelength \( \lambda \) of the light used:$$ W_{\text p } ~=~ h \, f ~=~ h \, \frac{c}{\lambda} $$

Here \( h \) is the Planck's constant with the value: $$ h ~=~ 6.626 \cdot 10^{-34} \, \mathrm{Js} $$And \(c\) the speed of light with the value:$$ c ~=~ 3 \cdot 10^8 \, \frac{\mathrm m}{\mathrm s} $$